To start the next leg, Nick & the Don are in last place. Why did none of the other teams try for the Fast Forward? Are Nick & the Don far enough behind that the other teams feel they can stay ahead even if Nick & the Don get the FF? (Does Chateau have pitstop arrival times?) Could we have a new FF rule that only the last place team is eligible?
Bunching? Either flights (unlikely) or hours of operation (very likely) allow Nick/Don to catch up with the others to get the FF clue. From there, it's a taxi race, which N/D can certainly win. This has happened before - Adam/Rebecca, BJ/Tyler, David/Mary (through some Chotrickery), and especially Lori/Bolo have all gotten the FF while in last (under the new rule; TAR 1-4 had different FF strategy).
I'm not Chateau (I just play one on message boards), but if I had to hazard a time guess, it would probably be:
Ron/Chris - 1:40
Goths - 1:45
Nate/Jen - 1:50
TK/Rachel - 4:00
Nick/Donald - 5:45
Given the speculative F3 (Nate/Jen, Nick/Donald, Bland/Blander) there has to either be some catch up provisions, major screw ups, and/or TBCs within the next few legs.